package com.yupi.yupao.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupao.common.ErrorCode;
import com.yupi.yupao.exception.BusinessException;
import com.yupi.yupao.model.domain.Team;
import com.yupi.yupao.model.domain.User;
import com.yupi.yupao.model.domain.UserTeam;
import com.yupi.yupao.model.dto.TeamQuery;
import com.yupi.yupao.model.enums.TeamStatusEnum;
import com.yupi.yupao.model.request.TeamJoinRequest;
import com.yupi.yupao.model.request.TeamQuitRequest;
import com.yupi.yupao.model.request.TeamUpdateRequest;
import com.yupi.yupao.model.vo.TeamUserVO;
import com.yupi.yupao.model.vo.UserVO;
import com.yupi.yupao.service.TeamService;
import com.yupi.yupao.mapper.TeamMapper;
import com.yupi.yupao.service.UserService;
import com.yupi.yupao.service.UserTeamService;
import org.apache.commons.lang3.StringUtils;
import org.redisson.api.RedissonClient;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import javax.annotation.Resource;
import java.time.temporal.Temporal;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Optional;

/**
* @author DELL
* @description 针对表【team(队伍)】的数据库操作Service实现
* @createDate 2023-10-16 18:04:05
*/
@Service
public class TeamServiceImpl extends ServiceImpl<TeamMapper, Team>
    implements TeamService {

    @Resource
    private UserTeamService userTeamService;

    @Resource
    private UserService userService;

    @Resource
    private RedissonClient redissonClient;


    @Override
    @Transactional
    public long addTeam(Team team, User loginUser) {
            // 1. 请求参数是否为空？
            if (team == null) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR);
            }
            // 2. 是否登录，未登录不允许创建
            if (loginUser == null) {
                throw new BusinessException(ErrorCode.NOT_LOGIN);
            }
            final long userId = loginUser.getId();
            // 3. 校验信息
            //   1. 队伍人数 > 1 且 <= 20
            int maxNum = Optional.ofNullable(team.getMaxNum()).orElse(0);
            if (maxNum < 1 || maxNum > 20) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍人数不满足要求");
            }
            //   2. 队伍标题 <= 20
            String name = team.getName();
            if (StringUtils.isBlank(name) || name.length() > 20) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍标题不满足要求");
            }
            //   3. 描述 <= 512
            String description = team.getDescription();
            if (StringUtils.isNotBlank(description) && description.length() > 512) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍描述过长");
            }
            //   4. status 是否公开（int）不传默认为 0（公开）
            int status = Optional.ofNullable(team.getStatus()).orElse(0);
            TeamStatusEnum statusEnum = TeamStatusEnum.getEnumByValue(status);
            if (statusEnum == null) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍状态不满足要求");
            }
            //   5. 如果 status 是加密状态，一定要有密码，且密码 <= 32
            String password = team.getPassword();
            if (TeamStatusEnum.SECRET.equals(statusEnum)) {
                if (StringUtils.isBlank(password) || password.length() > 32) {
                    throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码设置不正确");
                }
            }
            // 6. 超时时间 > 当前时间
            Date expireTime = team.getExpireTime();
            if (new Date().after(expireTime)) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "超时时间 > 当前时间");
            }
            // 7. 校验用户最多创建 5 个队伍
            // todo 有 bug，可能同时创建 100 个队伍
            QueryWrapper<Team> queryWrapper = new QueryWrapper<>();
            queryWrapper.eq("userId", userId);
            long hasTeamNum = this.count(queryWrapper);
            if (hasTeamNum >= 5) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户最多创建 5 个队伍");
            }
            // 8. 插入队伍信息到队伍表
            team.setId(null);
            team.setUserId(userId);
            boolean result = this.save(team);
            Long teamId = team.getId();
            if (!result || teamId == null) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "创建队伍失败");
            }
            // 9. 插入用户  => 队伍关系到关系表
            UserTeam userTeam = new UserTeam();
            userTeam.setUserId(userId);
            userTeam.setTeamId(teamId);
            userTeam.setJoinTime(new Date());
            result = userTeamService.save(userTeam);
            if (!result) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "创建队伍失败");
            }
            return teamId;
    }

    @Override
    public List<TeamUserVO> listTeams(TeamQuery teamQuery,boolean isAdmin) {
        QueryWrapper<Team> queryWrapper=new QueryWrapper<>();
        if(teamQuery!=null){
            Long id =teamQuery.getId();
            if(id!=null && id>0){
                queryWrapper.eq("id",id);
            }
            String searchText = teamQuery.getSearchText();
            if (StringUtils.isNotBlank(searchText)) {
                queryWrapper.and(qw -> qw.like("name", searchText).or().like("description", searchText));
            }

            String name = teamQuery.getName();
            if(StringUtils.isNotBlank(name)){
                queryWrapper.like("name",name);
            }
            String desciption = teamQuery.getDescription();
            if(StringUtils.isNotBlank(desciption)){
                queryWrapper.like("description",desciption);
            }
            Integer maxNum = teamQuery.getMaxNum();
            if(maxNum!=null && maxNum>0){
                queryWrapper.eq("maxNum",maxNum);
            }
            Long userId=teamQuery.getUserId();
            if(maxNum!=null && userId>0){
                queryWrapper.eq("userId",userId);
            }
            // 根据状态来查询
            Integer status = teamQuery.getStatus();
            TeamStatusEnum statusEnum = TeamStatusEnum.getEnumByValue(status);
            if (statusEnum == null) {
                statusEnum = TeamStatusEnum.PUBLIC;
            }
            if (!isAdmin && statusEnum.equals(TeamStatusEnum.PRIVATE)) {
                throw new BusinessException(ErrorCode.NO_AUTH);
            }
            queryWrapper.eq("status", statusEnum.getValue());


        }
        queryWrapper.and(qw -> qw.gt("expireTime", new Date()).or().isNull("expireTime"));
        List<Team> teamList=this.list(queryWrapper);
        if(CollectionUtils.isEmpty(teamList)){
            return new ArrayList<>();
        }
        List<TeamUserVO> teamUserVOList=new ArrayList<>();
        // 关联查询创建人的用户信息
        for (Team team : teamList) {
            Long userId = team.getUserId();
            if (userId == null) {
                continue;
            }
            User user = userService.getById(userId);
            TeamUserVO teamUserVO = new TeamUserVO();
            BeanUtils.copyProperties(team, teamUserVO);
            // 脱敏用户信息
            if(user != null) {
                UserVO userVO = new UserVO();
                BeanUtils.copyProperties(user, userVO);
                teamUserVO.setCreateUser(userVO);
            }
            teamUserVOList.add(teamUserVO);
        }
        return teamUserVOList;

    }

    @Override
    public boolean updateTeam(TeamUpdateRequest teamUpdateRequest,User loginUser) {
        if(teamUpdateRequest==null){
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        Long id =teamUpdateRequest.getId();
        if(id==null || id <=0){
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        Team oldTeam = this.getById(id);
        if (oldTeam == null) {
            throw new BusinessException(ErrorCode.NULL_ERROR, "队伍不存在");
        }
        // 只有管理员或者队伍的创建者可以修改
        if (oldTeam.getUserId() != loginUser.getId() && !userService.isAdmin(loginUser)) {
            throw new BusinessException(ErrorCode.NO_AUTH);
        }
        TeamStatusEnum statusEnum = TeamStatusEnum.getEnumByValue(teamUpdateRequest.getStatus());
        if (statusEnum.equals(TeamStatusEnum.SECRET)) {
            if (StringUtils.isBlank(teamUpdateRequest.getPassword())) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "加密房间必须要设置密码");
            }
        }
        Team updateTeam = new Team();
        BeanUtils.copyProperties(teamUpdateRequest, updateTeam);
        return this.updateById(updateTeam);

    }

    @Override
    public boolean joinTeam(TeamJoinRequest teamJoinRequest,User loginUser) {
        if (teamJoinRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }

        // 该用户已加入的队伍数量
        long userId = loginUser.getId();
        QueryWrapper<UserTeam> userTeamQueryWrapper = new QueryWrapper<>();
        userTeamQueryWrapper.eq("userId", userId);
        long hasJoinNum = userTeamService.count(userTeamQueryWrapper);
        if (hasJoinNum > 5) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "最多创建和加入 5 个队伍");
        }

        Long teamId = teamJoinRequest.getTeamId();
        Team team = getTeamById(teamId);
        Date expireTime = team.getExpireTime();
        if (expireTime != null && expireTime.before(new Date())) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍已过期");
        }
        Integer status = team.getStatus();
        TeamStatusEnum teamStatusEnum = TeamStatusEnum.getEnumByValue(status);
        if (TeamStatusEnum.PRIVATE.equals(teamStatusEnum)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "禁止加入私有队伍");
        }
        String password = teamJoinRequest.getPassword();
        if (TeamStatusEnum.SECRET.equals(teamStatusEnum)) {
            if (StringUtils.isBlank(password) || !password.equals(team.getPassword())) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
            }
        }

        // 不能重复加入已加入的队伍
        userTeamQueryWrapper = new QueryWrapper<>();
        userTeamQueryWrapper.eq("userId", userId);
        userTeamQueryWrapper.eq("teamId", teamId);
        long hasUserJoinTeam = userTeamService.count(userTeamQueryWrapper);
        if (hasUserJoinTeam > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户已加入该队伍");
        }
        // 已加入队伍的人数
        long teamHasJoinNum = this.countTeamUserByTeamId(teamId);
        if (teamHasJoinNum >= team.getMaxNum()) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍已满");
        }


        return false;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public boolean quitTeam(TeamQuitRequest teamQuitRequest, User loginUser) {
        if (teamQuitRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        Long teamId = teamQuitRequest.getTeamId();
        Team team = getTeamById(teamId);
        long userId = loginUser.getId();
        UserTeam queryUserTeam = new UserTeam();
        queryUserTeam.setTeamId(teamId);
        queryUserTeam.setUserId(userId);
        QueryWrapper<UserTeam> queryWrapper = new QueryWrapper<>(queryUserTeam);
        long count = userTeamService.count(queryWrapper);
        if (count == 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "未加入队伍");
        }
        long teamHasJoinNum = this.countTeamUserByTeamId(teamId);
        // 队伍只剩一人，解散
        if (teamHasJoinNum == 1) {
            // 删除队伍
            this.removeById(teamId);
        } else {
            // 队伍还剩至少两人
            // 是队长
            if (team.getUserId() == userId) {
                // 把队伍转移给最早加入的用户
                // 1. 查询已加入队伍的所有用户和加入时间
                QueryWrapper<UserTeam> userTeamQueryWrapper = new QueryWrapper<>();
                userTeamQueryWrapper.eq("teamId", teamId);
                userTeamQueryWrapper.last("order by id asc limit 2");
                List<UserTeam> userTeamList = userTeamService.list(userTeamQueryWrapper);
                if (CollectionUtils.isEmpty(userTeamList) || userTeamList.size() <= 1) {
                    throw new BusinessException(ErrorCode.SYSTEM_ERROR);
                }
                UserTeam nextUserTeam = userTeamList.get(1);
                Long nextTeamLeaderId = nextUserTeam.getUserId();
                // 更新当前队伍的队长
                Team updateTeam = new Team();
                updateTeam.setId(teamId);
                updateTeam.setUserId(nextTeamLeaderId);
                boolean result = this.updateById(updateTeam);
                if (!result) {
                    throw new BusinessException(ErrorCode.SYSTEM_ERROR, "更新队伍队长失败");
                }
            }
        }
        // 移除关系
        return userTeamService.remove(queryWrapper);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public boolean deleteTeam(long id, User loginUser) {
        // 校验队伍是否存在
        Team team = getTeamById(id);
        long teamId = team.getId();
        // 校验你是不是队伍的队长
        if (team.getUserId() != loginUser.getId()) {
            throw new BusinessException(ErrorCode.NO_AUTH, "无访问权限");
        }
        // 移除所有加入队伍的关联信息
        QueryWrapper<UserTeam> userTeamQueryWrapper = new QueryWrapper<>();
        userTeamQueryWrapper.eq("teamId", teamId);
        boolean result = userTeamService.remove(userTeamQueryWrapper);
        if (!result) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "删除队伍关联信息失败");
        }
        // 删除队伍
        return this.removeById(teamId);
    }



    /**
     * 根据 id 获取队伍信息
     *
     * @param teamId
     * @return
     */
    private Team getTeamById(Long teamId) {
        if (teamId == null || teamId <= 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        Team team = this.getById(teamId);
        if (team == null) {
            throw new BusinessException(ErrorCode.NULL_ERROR, "队伍不存在");
        }
        return team;
    }

    /**
     * 获取某队伍当前人数
     *
     * @param teamId
     * @return
     */
    private long countTeamUserByTeamId(long teamId) {
        QueryWrapper<UserTeam> userTeamQueryWrapper = new QueryWrapper<>();
        userTeamQueryWrapper.eq("teamId", teamId);
        return userTeamService.count(userTeamQueryWrapper);
    }

}





